laboursonline – MCQs, Mock Tests | Engineering Civil Engineering -MCQS-Hydraulics Section 1

A pitot tube is used to measure

1. pressure
2. difference in pressure
3. velocity of flow
4. none of these.

✅ Correct Answer: 3

The thickness of a sharp crested weir is kept less than

1. one-third of the height of water on the sill
2. one-half of the height of water on the sill
3. one-fourth of the height of water on the sill
4. two-third of the height of water on the sill

✅ Correct Answer: 2

The property of steam function ψ is :

1. ψ is constant everwhere on any stream line
2. the flow around any path in the fluid is zero for continuous flow
3. the rate of change of ψ with distance in an arbitrary direction, is proportional to the component of velocity normal to that direction
4. all the above.

✅ Correct Answer: 4

The maximum vacuum created at the summit of a syphon is

1. 2.7 m of water
2. 7.4 m of water
3. 5.5 m of water
4. none.

✅ Correct Answer: 2

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.1 kg/cm2, the pressure at a depth of 2.5 m, is

1. 1 metre of water
2. 2 metres of water
3. 3 metres of water
4. 3.5 metres of water

✅ Correct Answer: 3

The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at its centroid, if

1. area is horizontal
2. area is vertical
3. area is inclined
4. all the above.

✅ Correct Answer: 4

If the volume of a liquid weighing 3000 kg is 4 cubic metres, 0.75 is its

1. specific weight
2. specific mass
3. specific gravity
4. none of these.

✅ Correct Answer: 3

Bernoulli's equation assumes that

1. fluid is non-viscous
2. fluid is homogeneous
3. flow is steady
4. all the above.

✅ Correct Answer: 4

A syphon is used

1. to connect water reservoirs at different levels intervened by a hill
2. to supply water to a town from higher level to lower level
3. to fill up a tank with water at higher level from a lower level
4. none of these.

✅ Correct Answer: 1

Most economical section of a circular channel for maximum discharge

1. depth of water = 0.95 diameter of circular section
2. hydraulic mean depth = 0.286 diameter of circular section
3. wetted perimeter = 2.6 diameter of circular section
4. all the above.

✅ Correct Answer: 4

The ratio of maximum velocity to average velocity of viscous fluid through a circular pipe is

1. 0.5
2. 0.75
3. 1.25
4. 2

✅ Correct Answer: 4

The shear stress distribution in viscous fluid through a circular pipe is :

1. maximum at the centre
2. maximum at the inside of surface
3. same throughout the section
4. none of these.

✅ Correct Answer: 3

The side slope of Cipolletti weir is generally kept

1. 1 to 4
2. 1 to 3
3. 1 to 2
4. 1 : 5

✅ Correct Answer: 1

The momentum correction factor (β) for the viscous flow through a circular pipe is

1. 1.25
2. 1.33
3. 1.5
4. 1.66

✅ Correct Answer: 2

A piezometer opening in pipes measures

1. velocity head
2. static pressure
3. total pressure
4. negative static pressure.

✅ Correct Answer: 2

An independent mass of a fluid does not posses

1. elevation energy
2. kinetic energy
3. pressure energy
4. none of these.

✅ Correct Answer: 3

A short tube mouthpiece will not run full at its outlet if the head under which the orifice works, is

1. less than 12.2 m of the water
2. more than 12.2 m of the water
3. equal of 12.2 m of water
4. none of these.

✅ Correct Answer: 2

Hydrostatic pressure on a dam depends upon its

1. length
2. depth
3. shape
4. both (b) and (c).

✅ Correct Answer: 4

Maximum efficiency of transmission of power through a pipe, is

1. 25%
2. 33.30%
3. 50%
4. 66.67%.

✅ Correct Answer: 4

An ideal flow of a liquid obeys

1. Continuity equation
2. Newton's law of viscosity
3. Newton's second law of motion
4. dynamic viscosity law,

✅ Correct Answer: 1

Reynold number is the ratio of initial force and

1. viscosity
2. elasticity
3. gravitational force
4. surface tension.

✅ Correct Answer: 1

When a body is totally or partially immersed in a fluid, it is buoyed up by a force equal to

1. weight of the body
2. weight of the fluid displaced by the body
3. weight of the body and fluild displaced by the body
4. none of these.

✅ Correct Answer: 2

If the total head of the nozzle of a pipe is 37.5 m and discharge is 1 cumec, the power generated is

1. 400 H.P.
2. 450 H.P.
3. 500 H.P.
4. 550 H.P.

✅ Correct Answer: 3

The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is

1. water hammer
2. hydraulic jump
3. critical discharge
4. none of these.

✅ Correct Answer: 2

The horizontal component of the force on a curved surface is equal to

1. weight of liquid vertically below the curved surface
2. force on a vetical projection of the curved surface
3. product of pressure at its centroid and the area
4. weight of liquid retained by the curved area.

✅ Correct Answer: 2

The radius of gyration of the water line of a floating ship is 4 m and its metacentric height is 72.5 cm. The period of oscillation of the ship, is

1. π
2. 2π
3. 3π
4. 4π

✅ Correct Answer: 3

Differential manometers are used to measure

1. pressure in water channels, pipes, etc.
2. difference in pressure at two points
3. atmospheric pressure
4. very low pressure.

✅ Correct Answer: 2

A tank 4m x 3m x 2m containing an oil of specific gravity 0.83 is moved with an acceleration g/2 m sec2. The ratio of the pressures at its bottom when it is moving vertically up and down, is

1. 2
2. 3
3. 1 upon 2
4. 1 upon 3

✅ Correct Answer: 2

Highest dam in India, is

1. Bhakra dam
2. Hirakund dam
3. Nagarjuna Sagar dam
4. Iddiki dam.

✅ Correct Answer: 1